CBD and CBG may promote bone fracture healing, manage pain

The results were published in the Journal of Bone and Mineral Research.

Scientists estimate that more than 178 million people suffer from bone fracture injuries annually around the globe. According to corresponding author Reyad Elbarbary, associate professor of orthopaedics and rehabilitation at Penn State College of Medicine, current methods for managing pain, often nonsteroidal anti-inflammatory drugs (NSAIDS) like aspirin, are not optimal.

"NSAIDS may help patients manage pain, but they also reduce inflammation, which is a crucial first step in fracture healing," Elbarbary said. "An alternative for pain management is needed that does not prevent inflammation from occurring."

Elbarbary and his team's primary goal was to measure CBD and CBG's separate abilities to alleviate pain in mice. The team, in what they called the first study to analyze cannabinoids in the context of fracture healing and pain management, found that the cannabinoids were comparable to the NSAIDS in their ability to manage pain. But they said they were also surprised to find that CBD and CBG helped with the fracture healing process. With immunofluorescence microscopy, microcomputer tomography imaging and biomechanical testing, the researchers studied the fracture healing process -- everything from bone density and bone strength to the expression of genes that are necessary for the progression of fracture healing.

In the early phase of treatment, the cannabinoids were associated with an increase in the abundance of periosteal bone progenitors, which later develop into specialized bone cells that help bone tissue form. During the later phase of healing, CBD and CBG accelerated the process by which the body absorbs minerals to strengthen newly formed bone.

"Both treatments led to higher bone volume fraction and mineral density than with NSAID treatments, which leads to a functional and healthy newly formed bone," Elbarbary said. "We still have a lot to learn about the biological mechanisms behind what we observed."

According to Elbarbary, future research will focus on defining the cellular and molecular processes behind the cannabinoids' role in early and late stages of fracture healing, as well as developing a clinical formulation for use in adult fracture patients. While CBD is already approved by the Federal Drug Administration to treat seizures in children, finding a formulation, or dose, that is suitable for adults in the context of bone fractures will be a critical next step, Elbarbary said.

"There is already robust safety information gathered on CBD," Elbarbary explained. "CBG is more investigational at this stage. It's more likely that CBD would be repurposed for treating fractures once a formulation is found and its efficacy for treatment in the context of bone fractures is determined."

Deepak Kumar Khajuria, Vengadeshprabhu Karuppagounder, Irena Nowak, Diana Sepulveda, Gregory Lewis, Christopher Norbury, Wesley Raup Konsavage, Kent Vrana and Fadia Kamal of Penn State College of Medicine also contributed to this research. The authors declare no conflicts of interest.

The National Institutes of Health and PA Options for Wellness supported this research.